Lemon Layer Cake With Blueberry Buttercream

INGREDIENTS

3 3/4 cups

cake flour, sifted before measuring

1 tbsp

baking powder

1/4 tsp

baking soda

1 1/2 tsp

kosher salt

2 1/2 cups

granulated white sugar

1 1/8 cups

unsalted butter, room temperature

eggs, room temperature

1/2 cup

sour cream, room temperature

1 1/2 tsp

pure vanilla extract

1 tbsp

pure lemon extract

1 1/2 tbsp

fresh lemon zest (1 large lemon or 2 small)

1 1/2 cups

whole milk, room temperature

2 cups

unsalted butter, room temperature

packages (68g) Trader Joe's freeze dried blueberries

6 tbsp

whole milk, room temperature

2 tsp

pure vanilla extract

7 cups

powdered sugar

1/4 tsp

kosher salt